Nanometer porous tungsten trioxide material and its prepn and application

A technology of tungsten trioxide and nanomaterials, which is applied in the growth of polycrystalline materials, chemical instruments and methods, electrolytic coatings, etc., can solve the problem that the photoelectric properties of porous tungsten trioxide nanomaterials have not been better applied, and achieve good results. Effects of photoelectrochemical characteristics, uniform size and shape of pores, and improvement of surface morphology

Inactive Publication Date: 2007-06-06
DALIAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Benefits of technology

This patented technology describes methods used during manufacturing processes involving creation of special types of structures called microporous or mesoporated ceramics (MTC). These techniques involve combining specific chemical substances together like silicate glass powder and liquid acids at certain temperatures. By adjusting these parameters, it allows for precise control over how well different components mix on top of each other without causing damage. Micron sized particles made from this mixture help form MCTS, making them easier to process properly. Additionally, there're also some technical features associated with this technique such as enhanced stability when exposed to light, reduced pH values near neutral levels, increased solubilizability, controlled particle sizes, and better optical properties than existing materials.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding materials with uniform sizes and consistency across multiple dimensions while maintaining their desired optical property through strong bonding between atoms at opposite sides during synthesis processes such as sintered powder metallurgy.

Method used

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  • Nanometer porous tungsten trioxide material and its prepn and application
  • Nanometer porous tungsten trioxide material and its prepn and application
  • Nanometer porous tungsten trioxide material and its prepn and application

Examples

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Embodiment 1

[0028]Example 1 Cut the tungsten sheet into a size of 25×50mm, and then polish it successively with sandpaper of 400 mesh, 600 mesh, 800 mesh, 1000 mesh and 1200 mesh respectively, and connect it with a wire to make an electrode; place the tungsten sheet in acetone, Ultrasonic cleaning in isopropanol, methanol and deionized water, and drying with nitrogen; mix 0.2wt% sodium fluoride (NaF) and 0.3% (V / V) hydrofluoric acid (HF) in a ratio of 1:1 After pouring into the electrolytic cell, the concentration of fluoride ion in the electrolyte is 0.11mol / L, and the concentration of hydrogen ion is 0.086mol / L. With tungsten sheet as anode and platinum electrode as cathode, control the temperature of the electrolyte at 20±1°C, first oxidize at 60V for 60 minutes, and then oxidize at 40V for 30 minutes; oxidize the tungsten sheet with diluted Soak in hydrofluoric acid for a few seconds and rinse with deionized water; finally calcined at 450°C for 4h in an oxygen atmosphere. The scannin...

Embodiment 2

[0030] Embodiment 2 By the preparation method of the present invention of embodiment 1, just change electrolytic solution into 0.6wt% sodium fluoride (NaF) and 0.5mol / L sulfuric acid (H 2 SO 4 ) in a ratio of 1:1, that is, the concentration of fluoride ions is 0.07mol / L, and the concentration of hydrogen ions is 0.5mol / L. Porous tungsten trioxide nanomaterials with a self-assembled structure were obtained, the average pore diameter was about 100 nm, and the crystal structure was the same as in Example 1.

Embodiment 3

[0031] Embodiment 3 According to the preparation method of the present invention of embodiment 1, just change electrolytic solution into 1.0wt% ammonium fluoride (NH 4 F) and 0.5mol / L hydrochloric acid (HCl) are mixed in a ratio of 1:1, that is, the concentration of fluoride ion is 0.24mol / L, and the concentration of hydrogen ion is 0.25mol / L. Porous tungsten trioxide nanomaterials with a self-assembled structure were obtained, the average pore diameter was about 120 nm, and the crystal structure was the same as in Example 1.

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Abstract

The present invention relates to nanometer porous WO3 material, and is especially nanometer porous WO3 material formed through molecule self-assembling and with homogeneous structure, pore diameter of 60-150 nm, regular arrangement and (002) face oriented monoclinic system structure. The nanometer porous WO3 material is prepared through a constant current anode oxidation process with metal W substrate and electrolyte solution, which consists of inorganic fluoride sodium fluoride, potassium fluoride or ammonium fluoride and inorganic strong acid hydrofluoric acid, hydrochloric acid or sulfuric acid and has F- ion concentration of 0.05-0.3 mol/L and H+ ion concentration of 0.05-0.5 mol/L. The nanometer porous WO3 material has high photocatalytic capacity and is one kind of high efficiency photocatalyst.

Description

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Claims

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Application Information

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Owner DALIAN UNIV OF TECH
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